[PATCH 0/5] ASoC: ti: davinci-mcasp: Fix the DIT mode and OMAP4 support

[H. Nikolaus Schaller]

Hi Péter,

> Am 04.07.2021 um 17:04 schrieb Peter Ujfalusi <peter.ujfalusi at gmail.com>:
> 
> Hi,
> 
> it has been on my todo list for several years to support McASP on OMAP4 devices.
> For Galaxy Nexus we had an omap-mcasp driver (which was mostly a stripped down
> davinci-mcasp driver) to support what was needed on that specific phone + it's
> dock for S/PDIF (48KHz, 16bit, stereo).
> 
> Not many (if any) device available to test the DIT mode of McASP.
> I have used BeagleBone White (McASP1 AXR3 can be routed to a pin) to get the
> S/PDIF mode working then PandaES for OMAP4 support (on PandaES the gpio_121 is
> not used and the signal is routed to expansion J6 pin14)
> 
> In theory the McASP in OMAP5 should be working after this series, but the OMAP5
> TRM is not public and I do not have one to check the addresses and see if there
> is a way to test it on omap5-uevm.
> 
> Mark, Tony:
> The ASoC and dts patches can go via separate tree I felt that it is better if
> they are together, at least initially.
> 
> Nikolaus: fyi, this might be useful for Pyra?

Yes, definitively.

I just wonder how compatible it is with the "old" omap-mcasp driver we carry
along for the Pyra:

https://git.goldelico.com/?p=letux-kernel.git;a=blob;f=sound/soc/ti/omap-mcasp.c;h=24d839a24f34ec02456176744d3690016592b5a3;hb=7789ab635e56a2fd9fe04ca2e9ccfeaccb8e0f52

Does it now have additional functionality or robustness?
And does it need changes of the OMAP5 device tree?

And also important seems to be the ABE/AESS integration where we so far failed
to make it work again on more recent kernels. Our most recent patch set is here:

https://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/letux/aess-v5

Anyways I am happy to see a little progress on the omap4/5 audio subsystem.

BR and thanks,
Nikolaus



> 
> Regards,
> Péter
> ---
> Peter Ujfalusi (5):
>  ASoC: ti: davinci-mcasp: Fix DIT mode support
>  ASoC: dt-bindings: davinci-mcasp: Add compatible string for OMAP4
>  ASoC: ti: davinci-mcasp: Add support for the OMAP4 version of McASP
>  ARM: dts: omap4-l4-abe: Correct sidle modes for McASP
>  ARM: dts: omap4-l4-abe: Add McASP configuration
> 
> .../bindings/sound/davinci-mcasp-audio.txt    |   1 +
> arch/arm/boot/dts/omap4-l4-abe.dtsi           |  39 ++--
> include/linux/platform_data/davinci_asp.h     |   1 +
> sound/soc/ti/Kconfig                          |   1 +
> sound/soc/ti/davinci-mcasp.c                  | 168 +++++++++++++++---
> 5 files changed, 168 insertions(+), 42 deletions(-)
> 
> -- 
> 2.32.0
>